Made of cheap thin plastic. The threads will mate with a 1/2" PVC threaded fitting, but will hardly go in more than 3/8" before becoming too tight to hand tighten. I tried tightening it further with a wrench but the nozzle broke off at the base of the threads. The plastic at the base of the thread was paper thin. I only screwed the second nozzle in by hand up to the stop. It doesn't look very nice, but now it has to be.
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